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    <title>Document</title>
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<!-- 数据代理：通过一个对象代理对另一个对象中的属性的操作（读写） -->

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<script type="text/javascript">
    let obj1 = { x: 100 };
    let obj2 = { y: 200 }; //这里obj2是代理
    //表面上在操作obj2，实际上都是obj1
    Object.defineProperty(obj2, 'x', {
        get() {
            return obj1.x;
        },
        set(value) {
            obj1.x = value;
        }
    })
</script>

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